diff --git a/internal/domain/ticket.go b/internal/domain/ticket.go
new file mode 100644
index 0000000..35f5477
--- /dev/null
+++ b/internal/domain/ticket.go
@@ -0,0 +1,34 @@
+package domain
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+type Ticket struct {
+	// A random string that can be redeemed for an access token.
+	Ticket string
+
+	// The access token will work at this URL.
+	Resource *URL
+
+	// The access token should be used when acting on behalf of this URL.
+	Subject *Me
+}
+
+func TestTicket(tb testing.TB) *Ticket {
+	tb.Helper()
+
+	subject, err := NewMe("https://bob.example.org/")
+	require.NoError(tb, err)
+
+	resource, err := NewURL("https://alice.example.com/private/")
+	require.NoError(tb, err)
+
+	return &Ticket{
+		Ticket:   "32985723984723985792834",
+		Resource: resource,
+		Subject:  subject,
+	}
+}